Question

An object of size 7cm is placed at 27cm in front of a concave mirror of focal length 18cm at what distance from the mirror should a screen be placed so that a sharp of cussed image can be obtained? find the size and nature of image ?​

Answer 1

Answer:

size of image is 14 cm and nature is real

Explanation:

size of object(o)=7

size of image (i)=?

focal length (f)=18 cm

distance of object(u)=-27 cm (as in front of concave mirror)

now,

1/f=1/v+1/u

1/18-1/-27=1/v

1/-54=1/v

v=54

now,

m=-v/u

m=54/27

m=2

m=i/o

2=i/7

14 cm=i